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ELECTRIC IMPEDANCE OF ASTERIAS EGGS.

K S Cole¹, R H Cole

¹Department of Physiology, College of Physicians and Surgeons, Columbia University, New York, and the Biological Laboratory, Cold Spring Harbor, Long Island.

The Journal of General Physiology

|October 30, 2009

Summary

This summary is machine-generated.

This study measured the electrical properties of Asterias forbesi eggs. Egg plasma membranes have a static capacity, while cytoplasm resistance suggests high non-electrolyte concentration, with nuclei influencing high-frequency electrical behavior.

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Area of Science:

Cell biology
Biophysics
Marine biology

Background:

Understanding the electrical properties of cell membranes is crucial for cell function.
Asterias forbesi eggs provide a model system for studying basic cell biophysics.

Purpose of the Study:

To measure the alternating current resistance and capacity of unfertilized Asterias forbesi eggs.
To investigate the frequency-dependent electrical behavior of egg suspensions.
To determine the electrical properties of the plasma membrane and cytoplasm.

Main Methods:

Measurements of alternating current resistance and capacity.
Utilized frequencies ranging from 1,000 to 16,000,000 cycles per second.
Suspensions of unfertilized Asterias forbesi eggs were used.

Main Results:

The plasma membrane exhibits a static capacity of 1.10 microfarads/cm², largely independent of frequency.
Low-frequency capacity variations suggest surface conductance.
Cytoplasm specific resistance is 136–225 ohm cm, indicating high non-electrolyte content.
Evidence of nuclear influence on electrical properties at frequencies above 1 million cycles/second.

Conclusions:

The plasma membrane's electrical properties are relatively stable across frequencies.
Cytoplasmic composition differs significantly from seawater.
The nucleus plays a role in the high-frequency electrical response of the egg.